How to withdraw from blacklabel ads

hello,i have earned 20$ from blacklabel ads and i crossed my minimum payment my payment was due this months i.e 1st may 2012,but blacklabel ads dosen't sent my payment and added my payment to next months.I contacted them many times but they said i'll get my payment sent 10th of this month,But ithay didn't sent it.can you please tell me how much times it take to get payment and do they pay?

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